Income frequency is derived rather than asked

app/models/case_log.rb

@@ -132,7 +132,7 @@ class CaseLog < ApplicationRecord
   enum la_known: POLAR, _suffix: true
   enum net_income_known: NET_INCOME_KNOWN, _suffix: true
 
-  AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at renttype lettype is_la_inferred totchild totelder totadult].freeze
+  AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at renttype lettype is_la_inferred totchild totelder totadult incfreq].freeze
   OPTIONAL_FIELDS = %w[postcode_known
                        la_known
                        first_time_property_let_as_social_housing].freeze
@@ -215,7 +215,16 @@ private
       self.month = startdate.month
       self.year = startdate.year
     end
-    self.incref = 1 if net_income_known == "Tenant prefers not to say"
+    case net_income_known
+    when "Yes – the household has a weekly income"
+      self.incfreq = "Weekly"
+    when "Yes – the household has a monthly income"
+      self.incfreq = "Monthly"
+    when "Yes – the household has a yearly income"
+      self.incfreq = "Yearly"
+    when "Tenant prefers not to say"
+      self.incref = 1
+    end
     self.hhmemb = other_hhmemb + 1 if other_hhmemb.present?
     self.renttype = RENT_TYPE_MAPPING[rent_type]
     self.lettype = "#{renttype} #{needstype} #{owning_organisation['Org type']}" if renttype.present? && needstype.present? && owning_organisation["Org type"].present?
@@ -318,7 +327,6 @@ private
 
     if net_income_known == "Tenant prefers not to say"
       dynamically_not_required << "earnings"
-      dynamically_not_required << "incfreq"
     else
       dynamically_not_required << "incref"
     end

config/forms/2021_2022.json

@@ -1832,18 +1832,9 @@
                   "hint_text": "",
                   "type": "numeric",
                   "min": 0,
-                  "step": "1"
+                  "step": "1",
-                },
+                  "prefix": "£",
-                "incfreq": {
+                  "suffix": ""
-                  "check_answer_label": "Income Frequency",
-                  "header": "How often do they receive this income?",
-                  "hint_text": "",
-                  "type": "radio",
-                  "answer_options": {
-                    "0": "Weekly",
-                    "1": "Monthly",
-                    "2": "Yearly"
-                  }
                 }
               },
               "soft_validations": {

spec/factories/case_log.rb

@@ -71,7 +71,6 @@ FactoryBot.define do
       offered { 2 }
       wchair { "Yes" }
       earnings { 68 }
-      incfreq { "Weekly" }
       benefits { "Some" }
       period { "Fortnightly" }
       brent { 200 }

spec/fixtures/complete_case_log.json

@@ -76,7 +76,6 @@
     "wchair": "Yes",
     "net_income_known": "Yes – the household has a weekly income",
     "earnings": 0,
-    "incfreq": null,
     "benefits": "Some",
     "hb": "Universal Credit with housing element, but not Housing Benefit",
     "period": "Fortnightly",

spec/models/case_log_spec.rb

@@ -1167,6 +1167,17 @@ RSpec.describe Form, type: :model do
       end
     end
 
+    context "net_income" do
+      it "infers the income frequency" do
+        case_log.update!(net_income_known: "Yes – the household has a weekly income")
+        expect(case_log.reload.incfreq).to eq("Weekly")
+        case_log.update!(net_income_known: "Yes – the household has a monthly income")
+        expect(case_log.reload.incfreq).to eq("Monthly")
+        case_log.update!(net_income_known: "Yes – the household has a yearly income")
+        expect(case_log.reload.incfreq).to eq("Yearly")
+      end
+    end
+
     context "household members derived vars" do
       let!(:household_case_log) do
         CaseLog.create({